This ^^^.As a mechanic, when I had a good Phillips screwdriver that got bad, I would take it to a small bench grinder (6 in stones), and squared it off, grind two sides parallel, and just a tiny bit hollow ground and they made a nice screwdriver with the bit the same size as the shank. I used such screwdrivers for carburetor work, but they'll work beautiful to keep from messing up any screw head On any screw. If you work with this kind of stuff, is not hard to do.
Squint
I used my Dremel to adjust the blade width and add a bit of hollow grind to some cheap screwdrivers.
Working okay so far, until I get a set of proper hollow grind screwdrivers.